1 // SPDX-License-Identifier: GPL-2.0
2 /* Ethernet device driver for Cortina Systems Gemini SoC
3 * Also known as the StorLink SL3512 and SL3516 (SL351x) or Lepus
4 * Net Engine and Gigabit Ethernet MAC (GMAC)
5 * This hardware contains a TCP Offload Engine (TOE) but currently the
6 * driver does not make use of it.
9 * Linus Walleij <linus.walleij@linaro.org>
10 * Tobias Waldvogel <tobias.waldvogel@gmail.com> (OpenWRT)
11 * Michał Mirosław <mirq-linux@rere.qmqm.pl>
12 * Paulius Zaleckas <paulius.zaleckas@gmail.com>
13 * Giuseppe De Robertis <Giuseppe.DeRobertis@ba.infn.it>
14 * Gary Chen & Ch Hsu Storlink Semiconductor
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/cache.h>
24 #include <linux/interrupt.h>
25 #include <linux/reset.h>
26 #include <linux/clk.h>
28 #include <linux/of_mdio.h>
29 #include <linux/of_net.h>
30 #include <linux/of_platform.h>
31 #include <linux/etherdevice.h>
32 #include <linux/if_vlan.h>
33 #include <linux/skbuff.h>
34 #include <linux/phy.h>
35 #include <linux/crc32.h>
36 #include <linux/ethtool.h>
37 #include <linux/tcp.h>
38 #include <linux/u64_stats_sync.h>
42 #include <linux/ipv6.h>
46 #define DRV_NAME "gmac-gemini"
48 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
49 static int debug = -1;
50 module_param(debug, int, 0);
51 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
57 #define HBURST_SINGLE 0x00
58 #define HBURST_INCR 0x01
59 #define HBURST_INCR4 0x02
60 #define HBURST_INCR8 0x03
62 #define HPROT_DATA_CACHE BIT(0)
63 #define HPROT_PRIVILIGED BIT(1)
64 #define HPROT_BUFFERABLE BIT(2)
65 #define HPROT_CACHABLE BIT(3)
67 #define DEFAULT_RX_COALESCE_NSECS 0
68 #define DEFAULT_GMAC_RXQ_ORDER 9
69 #define DEFAULT_GMAC_TXQ_ORDER 8
70 #define DEFAULT_RX_BUF_ORDER 11
71 #define DEFAULT_NAPI_WEIGHT 64
72 #define TX_MAX_FRAGS 16
73 #define TX_QUEUE_NUM 1 /* max: 6 */
74 #define RX_MAX_ALLOC_ORDER 2
76 #define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
77 GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
78 #define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
79 GMAC0_SWTQ00_FIN_INT_BIT)
80 #define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
82 #define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
83 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
84 NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
87 * struct gmac_queue_page - page buffer per-page info
88 * @page: the page struct
89 * @mapping: the dma address handle
91 struct gmac_queue_page {
97 struct gmac_txdesc *ring;
100 unsigned int noirq_packets;
103 struct gemini_ethernet;
105 struct gemini_ethernet_port {
108 struct gemini_ethernet *geth;
109 struct net_device *netdev;
111 void __iomem *dma_base;
112 void __iomem *gmac_base;
114 struct reset_control *reset;
118 void __iomem *rxq_rwptr;
119 struct gmac_rxdesc *rxq_ring;
120 unsigned int rxq_order;
122 struct napi_struct napi;
123 struct hrtimer rx_coalesce_timer;
124 unsigned int rx_coalesce_nsecs;
125 unsigned int freeq_refill;
126 struct gmac_txq txq[TX_QUEUE_NUM];
127 unsigned int txq_order;
128 unsigned int irq_every_tx_packets;
130 dma_addr_t rxq_dma_base;
131 dma_addr_t txq_dma_base;
133 unsigned int msg_enable;
134 spinlock_t config_lock; /* Locks config register */
136 struct u64_stats_sync tx_stats_syncp;
137 struct u64_stats_sync rx_stats_syncp;
138 struct u64_stats_sync ir_stats_syncp;
140 struct rtnl_link_stats64 stats;
141 u64 hw_stats[RX_STATS_NUM];
142 u64 rx_stats[RX_STATUS_NUM];
143 u64 rx_csum_stats[RX_CHKSUM_NUM];
145 u64 tx_frag_stats[TX_MAX_FRAGS];
146 u64 tx_frags_linearized;
150 struct gemini_ethernet {
153 struct gemini_ethernet_port *port0;
154 struct gemini_ethernet_port *port1;
157 spinlock_t irq_lock; /* Locks IRQ-related registers */
158 unsigned int freeq_order;
159 unsigned int freeq_frag_order;
160 struct gmac_rxdesc *freeq_ring;
161 dma_addr_t freeq_dma_base;
162 struct gmac_queue_page *freeq_pages;
163 unsigned int num_freeq_pages;
164 spinlock_t freeq_lock; /* Locks queue from reentrance */
167 #define GMAC_STATS_NUM ( \
168 RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \
171 static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = {
178 "RX_STATUS_GOOD_FRAME",
179 "RX_STATUS_TOO_LONG_GOOD_CRC",
180 "RX_STATUS_RUNT_FRAME",
181 "RX_STATUS_SFD_NOT_FOUND",
182 "RX_STATUS_CRC_ERROR",
183 "RX_STATUS_TOO_LONG_BAD_CRC",
184 "RX_STATUS_ALIGNMENT_ERROR",
185 "RX_STATUS_TOO_LONG_BAD_ALIGN",
187 "RX_STATUS_DA_FILTERED",
188 "RX_STATUS_BUFFER_FULL",
194 "RX_CHKSUM_IP_UDP_TCP_OK",
195 "RX_CHKSUM_IP_OK_ONLY",
198 "RX_CHKSUM_IP_ERR_UNKNOWN",
200 "RX_CHKSUM_TCP_UDP_ERR",
219 "TX_FRAGS_LINEARIZED",
223 static void gmac_dump_dma_state(struct net_device *netdev);
225 static void gmac_update_config0_reg(struct net_device *netdev,
228 struct gemini_ethernet_port *port = netdev_priv(netdev);
232 spin_lock_irqsave(&port->config_lock, flags);
234 reg = readl(port->gmac_base + GMAC_CONFIG0);
235 reg = (reg & ~vmask) | val;
236 writel(reg, port->gmac_base + GMAC_CONFIG0);
238 spin_unlock_irqrestore(&port->config_lock, flags);
241 static void gmac_enable_tx_rx(struct net_device *netdev)
243 struct gemini_ethernet_port *port = netdev_priv(netdev);
247 spin_lock_irqsave(&port->config_lock, flags);
249 reg = readl(port->gmac_base + GMAC_CONFIG0);
250 reg &= ~CONFIG0_TX_RX_DISABLE;
251 writel(reg, port->gmac_base + GMAC_CONFIG0);
253 spin_unlock_irqrestore(&port->config_lock, flags);
256 static void gmac_disable_tx_rx(struct net_device *netdev)
258 struct gemini_ethernet_port *port = netdev_priv(netdev);
262 spin_lock_irqsave(&port->config_lock, flags);
264 val = readl(port->gmac_base + GMAC_CONFIG0);
265 val |= CONFIG0_TX_RX_DISABLE;
266 writel(val, port->gmac_base + GMAC_CONFIG0);
268 spin_unlock_irqrestore(&port->config_lock, flags);
270 mdelay(10); /* let GMAC consume packet */
273 static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx)
275 struct gemini_ethernet_port *port = netdev_priv(netdev);
279 spin_lock_irqsave(&port->config_lock, flags);
281 val = readl(port->gmac_base + GMAC_CONFIG0);
282 val &= ~CONFIG0_FLOW_CTL;
284 val |= CONFIG0_FLOW_TX;
286 val |= CONFIG0_FLOW_RX;
287 writel(val, port->gmac_base + GMAC_CONFIG0);
289 spin_unlock_irqrestore(&port->config_lock, flags);
292 static void gmac_speed_set(struct net_device *netdev)
294 struct gemini_ethernet_port *port = netdev_priv(netdev);
295 struct phy_device *phydev = netdev->phydev;
296 union gmac_status status, old_status;
300 status.bits32 = readl(port->gmac_base + GMAC_STATUS);
301 old_status.bits32 = status.bits32;
302 status.bits.link = phydev->link;
303 status.bits.duplex = phydev->duplex;
305 switch (phydev->speed) {
307 status.bits.speed = GMAC_SPEED_1000;
308 if (phy_interface_mode_is_rgmii(phydev->interface))
309 status.bits.mii_rmii = GMAC_PHY_RGMII_1000;
310 netdev_dbg(netdev, "connect %s to RGMII @ 1Gbit\n",
311 phydev_name(phydev));
314 status.bits.speed = GMAC_SPEED_100;
315 if (phy_interface_mode_is_rgmii(phydev->interface))
316 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
317 netdev_dbg(netdev, "connect %s to RGMII @ 100 Mbit\n",
318 phydev_name(phydev));
321 status.bits.speed = GMAC_SPEED_10;
322 if (phy_interface_mode_is_rgmii(phydev->interface))
323 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
324 netdev_dbg(netdev, "connect %s to RGMII @ 10 Mbit\n",
325 phydev_name(phydev));
328 netdev_warn(netdev, "Unsupported PHY speed (%d) on %s\n",
329 phydev->speed, phydev_name(phydev));
332 if (phydev->duplex == DUPLEX_FULL) {
333 u16 lcladv = phy_read(phydev, MII_ADVERTISE);
334 u16 rmtadv = phy_read(phydev, MII_LPA);
335 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
337 if (cap & FLOW_CTRL_RX)
339 if (cap & FLOW_CTRL_TX)
343 gmac_set_flow_control(netdev, pause_tx, pause_rx);
345 if (old_status.bits32 == status.bits32)
348 if (netif_msg_link(port)) {
349 phy_print_status(phydev);
350 netdev_info(netdev, "link flow control: %s\n",
352 ? (phydev->asym_pause ? "tx" : "both")
353 : (phydev->asym_pause ? "rx" : "none")
357 gmac_disable_tx_rx(netdev);
358 writel(status.bits32, port->gmac_base + GMAC_STATUS);
359 gmac_enable_tx_rx(netdev);
362 static int gmac_setup_phy(struct net_device *netdev)
364 struct gemini_ethernet_port *port = netdev_priv(netdev);
365 union gmac_status status = { .bits32 = 0 };
366 struct device *dev = port->dev;
367 struct phy_device *phy;
369 phy = of_phy_get_and_connect(netdev,
374 netdev->phydev = phy;
376 phy_set_max_speed(phy, SPEED_1000);
377 phy_support_asym_pause(phy);
379 /* set PHY interface type */
380 switch (phy->interface) {
381 case PHY_INTERFACE_MODE_MII:
383 "MII: set GMAC0 to GMII mode, GMAC1 disabled\n");
384 status.bits.mii_rmii = GMAC_PHY_MII;
386 case PHY_INTERFACE_MODE_GMII:
388 "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n");
389 status.bits.mii_rmii = GMAC_PHY_GMII;
391 case PHY_INTERFACE_MODE_RGMII:
392 case PHY_INTERFACE_MODE_RGMII_ID:
393 case PHY_INTERFACE_MODE_RGMII_TXID:
394 case PHY_INTERFACE_MODE_RGMII_RXID:
396 "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n");
397 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
400 netdev_err(netdev, "Unsupported MII interface\n");
402 netdev->phydev = NULL;
405 writel(status.bits32, port->gmac_base + GMAC_STATUS);
407 if (netif_msg_link(port))
408 phy_attached_info(phy);
413 /* The maximum frame length is not logically enumerated in the
414 * hardware, so we do a table lookup to find the applicable max
417 struct gmac_max_framelen {
418 unsigned int max_l3_len;
422 static const struct gmac_max_framelen gmac_maxlens[] = {
425 .val = CONFIG0_MAXLEN_1518,
429 .val = CONFIG0_MAXLEN_1522,
433 .val = CONFIG0_MAXLEN_1536,
437 .val = CONFIG0_MAXLEN_1548,
441 .val = CONFIG0_MAXLEN_9k,
445 .val = CONFIG0_MAXLEN_10k,
449 static int gmac_pick_rx_max_len(unsigned int max_l3_len)
451 const struct gmac_max_framelen *maxlen;
455 maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN;
457 for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) {
458 maxlen = &gmac_maxlens[i];
459 if (maxtot <= maxlen->max_l3_len)
466 static int gmac_init(struct net_device *netdev)
468 struct gemini_ethernet_port *port = netdev_priv(netdev);
469 union gmac_config0 config0 = { .bits = {
480 .port0_chk_classq = 1,
481 .port1_chk_classq = 1,
483 union gmac_ahb_weight ahb_weight = { .bits = {
488 .tq_dv_threshold = 0,
490 union gmac_tx_wcr0 hw_weigh = { .bits = {
496 union gmac_tx_wcr1 sw_weigh = { .bits = {
504 union gmac_config1 config1 = { .bits = {
508 union gmac_config2 config2 = { .bits = {
512 union gmac_config3 config3 = { .bits = {
516 union gmac_config0 tmp;
518 config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
519 tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
520 config0.bits.reserved = tmp.bits.reserved;
521 writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
522 writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
523 writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
524 writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
526 readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
527 writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
529 writel(hw_weigh.bits32,
530 port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
531 writel(sw_weigh.bits32,
532 port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
534 port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
535 port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
536 port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
538 /* Mark every quarter of the queue a packet for interrupt
539 * in order to be able to wake up the queue if it was stopped
541 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
546 static int gmac_setup_txqs(struct net_device *netdev)
548 struct gemini_ethernet_port *port = netdev_priv(netdev);
549 unsigned int n_txq = netdev->num_tx_queues;
550 struct gemini_ethernet *geth = port->geth;
551 size_t entries = 1 << port->txq_order;
552 struct gmac_txq *txq = port->txq;
553 struct gmac_txdesc *desc_ring;
554 size_t len = n_txq * entries;
555 struct sk_buff **skb_tab;
556 void __iomem *rwptr_reg;
560 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
562 skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
566 desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
567 &port->txq_dma_base, GFP_KERNEL);
574 if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
575 dev_warn(geth->dev, "TX queue base is not aligned\n");
576 dma_free_coherent(geth->dev, len * sizeof(*desc_ring),
577 desc_ring, port->txq_dma_base);
582 writel(port->txq_dma_base | port->txq_order,
583 port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
585 for (i = 0; i < n_txq; i++) {
586 txq->ring = desc_ring;
588 txq->noirq_packets = 0;
590 r = readw(rwptr_reg);
592 writew(r, rwptr_reg);
597 desc_ring += entries;
604 static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
607 struct gemini_ethernet_port *port = netdev_priv(netdev);
608 unsigned int m = (1 << port->txq_order) - 1;
609 struct gemini_ethernet *geth = port->geth;
610 unsigned int c = txq->cptr;
611 union gmac_txdesc_0 word0;
612 union gmac_txdesc_1 word1;
613 unsigned int hwchksum = 0;
614 unsigned long bytes = 0;
615 struct gmac_txdesc *txd;
616 unsigned short nfrags;
617 unsigned int errs = 0;
618 unsigned int pkts = 0;
629 mapping = txd->word2.buf_adr;
630 word3 = txd->word3.bits32;
632 dma_unmap_single(geth->dev, mapping,
633 word0.bits.buffer_size, DMA_TO_DEVICE);
636 dev_kfree_skb(txq->skb[c]);
641 if (!(word3 & SOF_BIT))
644 if (!word0.bits.status_tx_ok) {
650 bytes += txd->word1.bits.byte_count;
652 if (word1.bits32 & TSS_CHECKUM_ENABLE)
655 nfrags = word0.bits.desc_count - 1;
657 if (nfrags >= TX_MAX_FRAGS)
658 nfrags = TX_MAX_FRAGS - 1;
660 u64_stats_update_begin(&port->tx_stats_syncp);
661 port->tx_frag_stats[nfrags]++;
662 u64_stats_update_end(&port->tx_stats_syncp);
666 u64_stats_update_begin(&port->ir_stats_syncp);
667 port->stats.tx_errors += errs;
668 port->stats.tx_packets += pkts;
669 port->stats.tx_bytes += bytes;
670 port->tx_hw_csummed += hwchksum;
671 u64_stats_update_end(&port->ir_stats_syncp);
676 static void gmac_cleanup_txqs(struct net_device *netdev)
678 struct gemini_ethernet_port *port = netdev_priv(netdev);
679 unsigned int n_txq = netdev->num_tx_queues;
680 struct gemini_ethernet *geth = port->geth;
681 void __iomem *rwptr_reg;
684 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
686 for (i = 0; i < n_txq; i++) {
687 r = readw(rwptr_reg);
689 writew(r, rwptr_reg);
692 gmac_clean_txq(netdev, port->txq + i, r);
694 writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
696 kfree(port->txq->skb);
697 dma_free_coherent(geth->dev,
698 n_txq * sizeof(*port->txq->ring) << port->txq_order,
699 port->txq->ring, port->txq_dma_base);
702 static int gmac_setup_rxq(struct net_device *netdev)
704 struct gemini_ethernet_port *port = netdev_priv(netdev);
705 struct gemini_ethernet *geth = port->geth;
706 struct nontoe_qhdr __iomem *qhdr;
708 qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
709 port->rxq_rwptr = &qhdr->word1;
711 /* Remap a slew of memory to use for the RX queue */
712 port->rxq_ring = dma_alloc_coherent(geth->dev,
713 sizeof(*port->rxq_ring) << port->rxq_order,
714 &port->rxq_dma_base, GFP_KERNEL);
717 if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
718 dev_warn(geth->dev, "RX queue base is not aligned\n");
722 writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
723 writel(0, port->rxq_rwptr);
727 static struct gmac_queue_page *
728 gmac_get_queue_page(struct gemini_ethernet *geth,
729 struct gemini_ethernet_port *port,
732 struct gmac_queue_page *gpage;
736 /* Only look for even pages */
737 mapping = addr & PAGE_MASK;
739 if (!geth->freeq_pages) {
740 dev_err(geth->dev, "try to get page with no page list\n");
744 /* Look up a ring buffer page from virtual mapping */
745 for (i = 0; i < geth->num_freeq_pages; i++) {
746 gpage = &geth->freeq_pages[i];
747 if (gpage->mapping == mapping)
754 static void gmac_cleanup_rxq(struct net_device *netdev)
756 struct gemini_ethernet_port *port = netdev_priv(netdev);
757 struct gemini_ethernet *geth = port->geth;
758 struct gmac_rxdesc *rxd = port->rxq_ring;
759 static struct gmac_queue_page *gpage;
760 struct nontoe_qhdr __iomem *qhdr;
761 void __iomem *dma_reg;
762 void __iomem *ptr_reg;
768 TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
769 dma_reg = &qhdr->word0;
770 ptr_reg = &qhdr->word1;
772 rw.bits32 = readl(ptr_reg);
775 writew(r, ptr_reg + 2);
779 /* Loop from read pointer to write pointer of the RX queue
780 * and free up all pages by the queue.
783 mapping = rxd[r].word2.buf_adr;
785 r &= ((1 << port->rxq_order) - 1);
790 /* Freeq pointers are one page off */
791 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
793 dev_err(geth->dev, "could not find page\n");
796 /* Release the RX queue reference to the page */
797 put_page(gpage->page);
800 dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
801 port->rxq_ring, port->rxq_dma_base);
804 static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
807 struct gmac_rxdesc *freeq_entry;
808 struct gmac_queue_page *gpage;
809 unsigned int fpp_order;
810 unsigned int frag_len;
815 /* First allocate and DMA map a single page */
816 page = alloc_page(GFP_ATOMIC);
820 mapping = dma_map_single(geth->dev, page_address(page),
821 PAGE_SIZE, DMA_FROM_DEVICE);
822 if (dma_mapping_error(geth->dev, mapping)) {
827 /* The assign the page mapping (physical address) to the buffer address
828 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
829 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
830 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
831 * each page normally needs two entries in the queue.
833 frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
834 fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
835 freeq_entry = geth->freeq_ring + (pn << fpp_order);
836 dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
837 pn, frag_len, (1 << fpp_order), freeq_entry);
838 for (i = (1 << fpp_order); i > 0; i--) {
839 freeq_entry->word2.buf_adr = mapping;
844 /* If the freeq entry already has a page mapped, then unmap it. */
845 gpage = &geth->freeq_pages[pn];
847 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
848 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
849 /* This should be the last reference to the page so it gets
852 put_page(gpage->page);
855 /* Then put our new mapping into the page table */
856 dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
857 pn, (unsigned int)mapping, page);
858 gpage->mapping = mapping;
865 * geth_fill_freeq() - Fill the freeq with empty fragments to use
866 * @geth: the ethernet adapter
867 * @refill: whether to reset the queue by filling in all freeq entries or
868 * just refill it, usually the interrupt to refill the queue happens when
869 * the queue is half empty.
871 static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
873 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
874 unsigned int count = 0;
875 unsigned int pn, epn;
881 m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
883 spin_lock_irqsave(&geth->freeq_lock, flags);
885 rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
886 pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
887 epn = (rw.bits.rptr >> fpp_order) - 1;
890 /* Loop over the freeq ring buffer entries */
892 struct gmac_queue_page *gpage;
895 gpage = &geth->freeq_pages[pn];
898 dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
899 pn, page_ref_count(page), 1 << fpp_order);
901 if (page_ref_count(page) > 1) {
902 unsigned int fl = (pn - epn) & m_pn;
904 if (fl > 64 >> fpp_order)
907 page = geth_freeq_alloc_map_page(geth, pn);
912 /* Add one reference per fragment in the page */
913 page_ref_add(page, 1 << fpp_order);
914 count += 1 << fpp_order;
919 writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
921 spin_unlock_irqrestore(&geth->freeq_lock, flags);
926 static int geth_setup_freeq(struct gemini_ethernet *geth)
928 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
929 unsigned int frag_len = 1 << geth->freeq_frag_order;
930 unsigned int len = 1 << geth->freeq_order;
931 unsigned int pages = len >> fpp_order;
932 union queue_threshold qt;
933 union dma_skb_size skbsz;
937 geth->freeq_ring = dma_alloc_coherent(geth->dev,
938 sizeof(*geth->freeq_ring) << geth->freeq_order,
939 &geth->freeq_dma_base, GFP_KERNEL);
940 if (!geth->freeq_ring)
942 if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
943 dev_warn(geth->dev, "queue ring base is not aligned\n");
947 /* Allocate a mapping to page look-up index */
948 geth->freeq_pages = kcalloc(pages, sizeof(*geth->freeq_pages),
950 if (!geth->freeq_pages)
952 geth->num_freeq_pages = pages;
954 dev_info(geth->dev, "allocate %d pages for queue\n", pages);
955 for (pn = 0; pn < pages; pn++)
956 if (!geth_freeq_alloc_map_page(geth, pn))
957 goto err_freeq_alloc;
959 filled = geth_fill_freeq(geth, false);
961 goto err_freeq_alloc;
963 qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
964 qt.bits.swfq_empty = 32;
965 writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
967 skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
968 writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
969 writel(geth->freeq_dma_base | geth->freeq_order,
970 geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
976 struct gmac_queue_page *gpage;
980 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
981 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
982 gpage = &geth->freeq_pages[pn];
983 put_page(gpage->page);
986 kfree(geth->freeq_pages);
988 dma_free_coherent(geth->dev,
989 sizeof(*geth->freeq_ring) << geth->freeq_order,
990 geth->freeq_ring, geth->freeq_dma_base);
991 geth->freeq_ring = NULL;
996 * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
997 * @geth: the Gemini global ethernet state
999 static void geth_cleanup_freeq(struct gemini_ethernet *geth)
1001 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
1002 unsigned int frag_len = 1 << geth->freeq_frag_order;
1003 unsigned int len = 1 << geth->freeq_order;
1004 unsigned int pages = len >> fpp_order;
1007 writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
1008 geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
1009 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
1011 for (pn = 0; pn < pages; pn++) {
1012 struct gmac_queue_page *gpage;
1015 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
1016 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
1018 gpage = &geth->freeq_pages[pn];
1019 while (page_ref_count(gpage->page) > 0)
1020 put_page(gpage->page);
1023 kfree(geth->freeq_pages);
1025 dma_free_coherent(geth->dev,
1026 sizeof(*geth->freeq_ring) << geth->freeq_order,
1027 geth->freeq_ring, geth->freeq_dma_base);
1031 * geth_resize_freeq() - resize the software queue depth
1032 * @port: the port requesting the change
1034 * This gets called at least once during probe() so the device queue gets
1035 * "resized" from the hardware defaults. Since both ports/net devices share
1036 * the same hardware queue, some synchronization between the ports is
1039 static int geth_resize_freeq(struct gemini_ethernet_port *port)
1041 struct gemini_ethernet *geth = port->geth;
1042 struct net_device *netdev = port->netdev;
1043 struct gemini_ethernet_port *other_port;
1044 struct net_device *other_netdev;
1045 unsigned int new_size = 0;
1046 unsigned int new_order;
1047 unsigned long flags;
1051 if (netdev->dev_id == 0)
1052 other_netdev = geth->port1->netdev;
1054 other_netdev = geth->port0->netdev;
1056 if (other_netdev && netif_running(other_netdev))
1059 new_size = 1 << (port->rxq_order + 1);
1060 netdev_dbg(netdev, "port %d size: %d order %d\n",
1065 other_port = netdev_priv(other_netdev);
1066 new_size += 1 << (other_port->rxq_order + 1);
1067 netdev_dbg(other_netdev, "port %d size: %d order %d\n",
1068 other_netdev->dev_id,
1069 (1 << (other_port->rxq_order + 1)),
1070 other_port->rxq_order);
1073 new_order = min(15, ilog2(new_size - 1) + 1);
1074 dev_dbg(geth->dev, "set shared queue to size %d order %d\n",
1075 new_size, new_order);
1076 if (geth->freeq_order == new_order)
1079 spin_lock_irqsave(&geth->irq_lock, flags);
1081 /* Disable the software queue IRQs */
1082 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1083 en &= ~SWFQ_EMPTY_INT_BIT;
1084 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1085 spin_unlock_irqrestore(&geth->irq_lock, flags);
1087 /* Drop the old queue */
1088 if (geth->freeq_ring)
1089 geth_cleanup_freeq(geth);
1091 /* Allocate a new queue with the desired order */
1092 geth->freeq_order = new_order;
1093 ret = geth_setup_freeq(geth);
1095 /* Restart the interrupts - NOTE if this is the first resize
1096 * after probe(), this is where the interrupts get turned on
1097 * in the first place.
1099 spin_lock_irqsave(&geth->irq_lock, flags);
1100 en |= SWFQ_EMPTY_INT_BIT;
1101 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1102 spin_unlock_irqrestore(&geth->irq_lock, flags);
1107 static void gmac_tx_irq_enable(struct net_device *netdev,
1108 unsigned int txq, int en)
1110 struct gemini_ethernet_port *port = netdev_priv(netdev);
1111 struct gemini_ethernet *geth = port->geth;
1114 netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
1116 mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
1119 writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1121 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1122 val = en ? val | mask : val & ~mask;
1123 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1126 static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
1128 struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num);
1130 gmac_tx_irq_enable(netdev, txq_num, 0);
1131 netif_tx_wake_queue(ntxq);
1134 static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb,
1135 struct gmac_txq *txq, unsigned short *desc)
1137 struct gemini_ethernet_port *port = netdev_priv(netdev);
1138 struct skb_shared_info *skb_si = skb_shinfo(skb);
1139 unsigned short m = (1 << port->txq_order) - 1;
1140 short frag, last_frag = skb_si->nr_frags - 1;
1141 struct gemini_ethernet *geth = port->geth;
1142 unsigned int word1, word3, buflen;
1143 unsigned short w = *desc;
1144 struct gmac_txdesc *txd;
1145 skb_frag_t *skb_frag;
1153 if (skb->protocol == htons(ETH_P_8021Q))
1160 word1 |= TSS_MTU_ENABLE_BIT;
1164 if (skb->len >= ETH_FRAME_LEN) {
1165 /* Hardware offloaded checksumming isn't working on frames
1166 * bigger than 1514 bytes. A hypothesis about this is that the
1167 * checksum buffer is only 1518 bytes, so when the frames get
1168 * bigger they get truncated, or the last few bytes get
1169 * overwritten by the FCS.
1171 * Just use software checksumming and bypass on bigger frames.
1173 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1174 ret = skb_checksum_help(skb);
1178 word1 |= TSS_BYPASS_BIT;
1179 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1182 /* We do not switch off the checksumming on non TCP/UDP
1183 * frames: as is shown from tests, the checksumming engine
1184 * is smart enough to see that a frame is not actually TCP
1185 * or UDP and then just pass it through without any changes
1188 if (skb->protocol == htons(ETH_P_IP)) {
1189 word1 |= TSS_IP_CHKSUM_BIT;
1190 tcp = ip_hdr(skb)->protocol == IPPROTO_TCP;
1192 word1 |= TSS_IPV6_ENABLE_BIT;
1193 tcp = ipv6_hdr(skb)->nexthdr == IPPROTO_TCP;
1196 word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT;
1200 while (frag <= last_frag) {
1203 buflen = skb_headlen(skb);
1205 skb_frag = skb_si->frags + frag;
1206 buffer = skb_frag_address(skb_frag);
1207 buflen = skb_frag_size(skb_frag);
1210 if (frag == last_frag) {
1215 mapping = dma_map_single(geth->dev, buffer, buflen,
1217 if (dma_mapping_error(geth->dev, mapping))
1220 txd = txq->ring + w;
1221 txd->word0.bits32 = buflen;
1222 txd->word1.bits32 = word1;
1223 txd->word2.buf_adr = mapping;
1224 txd->word3.bits32 = word3;
1226 word3 &= MTU_SIZE_BIT_MASK;
1236 while (w != *desc) {
1240 dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr,
1241 txq->ring[w].word0.bits.buffer_size,
1247 static netdev_tx_t gmac_start_xmit(struct sk_buff *skb,
1248 struct net_device *netdev)
1250 struct gemini_ethernet_port *port = netdev_priv(netdev);
1251 unsigned short m = (1 << port->txq_order) - 1;
1252 struct netdev_queue *ntxq;
1253 unsigned short r, w, d;
1254 void __iomem *ptr_reg;
1255 struct gmac_txq *txq;
1256 int txq_num, nfrags;
1259 if (skb->len >= 0x10000)
1262 txq_num = skb_get_queue_mapping(skb);
1263 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num);
1264 txq = &port->txq[txq_num];
1265 ntxq = netdev_get_tx_queue(netdev, txq_num);
1266 nfrags = skb_shinfo(skb)->nr_frags;
1268 rw.bits32 = readl(ptr_reg);
1272 d = txq->cptr - w - 1;
1275 if (d < nfrags + 2) {
1276 gmac_clean_txq(netdev, txq, r);
1277 d = txq->cptr - w - 1;
1280 if (d < nfrags + 2) {
1281 netif_tx_stop_queue(ntxq);
1283 d = txq->cptr + nfrags + 16;
1285 txq->ring[d].word3.bits.eofie = 1;
1286 gmac_tx_irq_enable(netdev, txq_num, 1);
1288 u64_stats_update_begin(&port->tx_stats_syncp);
1289 netdev->stats.tx_fifo_errors++;
1290 u64_stats_update_end(&port->tx_stats_syncp);
1291 return NETDEV_TX_BUSY;
1295 if (gmac_map_tx_bufs(netdev, skb, txq, &w)) {
1296 if (skb_linearize(skb))
1299 u64_stats_update_begin(&port->tx_stats_syncp);
1300 port->tx_frags_linearized++;
1301 u64_stats_update_end(&port->tx_stats_syncp);
1303 if (gmac_map_tx_bufs(netdev, skb, txq, &w))
1307 writew(w, ptr_reg + 2);
1309 gmac_clean_txq(netdev, txq, r);
1310 return NETDEV_TX_OK;
1315 u64_stats_update_begin(&port->tx_stats_syncp);
1316 port->stats.tx_dropped++;
1317 u64_stats_update_end(&port->tx_stats_syncp);
1318 return NETDEV_TX_OK;
1321 static void gmac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1323 netdev_err(netdev, "Tx timeout\n");
1324 gmac_dump_dma_state(netdev);
1327 static void gmac_enable_irq(struct net_device *netdev, int enable)
1329 struct gemini_ethernet_port *port = netdev_priv(netdev);
1330 struct gemini_ethernet *geth = port->geth;
1331 unsigned long flags;
1334 netdev_dbg(netdev, "%s device %d %s\n", __func__,
1335 netdev->dev_id, enable ? "enable" : "disable");
1336 spin_lock_irqsave(&geth->irq_lock, flags);
1338 mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2);
1339 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1340 val = enable ? (val | mask) : (val & ~mask);
1341 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1343 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1344 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1345 val = enable ? (val | mask) : (val & ~mask);
1346 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1348 mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8);
1349 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1350 val = enable ? (val | mask) : (val & ~mask);
1351 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1353 spin_unlock_irqrestore(&geth->irq_lock, flags);
1356 static void gmac_enable_rx_irq(struct net_device *netdev, int enable)
1358 struct gemini_ethernet_port *port = netdev_priv(netdev);
1359 struct gemini_ethernet *geth = port->geth;
1360 unsigned long flags;
1363 netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id,
1364 enable ? "enable" : "disable");
1365 spin_lock_irqsave(&geth->irq_lock, flags);
1366 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1368 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1369 val = enable ? (val | mask) : (val & ~mask);
1370 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1372 spin_unlock_irqrestore(&geth->irq_lock, flags);
1375 static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port,
1376 union gmac_rxdesc_0 word0,
1377 unsigned int frame_len)
1379 unsigned int rx_csum = word0.bits.chksum_status;
1380 unsigned int rx_status = word0.bits.status;
1381 struct sk_buff *skb = NULL;
1383 port->rx_stats[rx_status]++;
1384 port->rx_csum_stats[rx_csum]++;
1386 if (word0.bits.derr || word0.bits.perr ||
1387 rx_status || frame_len < ETH_ZLEN ||
1388 rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) {
1389 port->stats.rx_errors++;
1391 if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status))
1392 port->stats.rx_length_errors++;
1393 if (RX_ERROR_OVER(rx_status))
1394 port->stats.rx_over_errors++;
1395 if (RX_ERROR_CRC(rx_status))
1396 port->stats.rx_crc_errors++;
1397 if (RX_ERROR_FRAME(rx_status))
1398 port->stats.rx_frame_errors++;
1402 skb = napi_get_frags(&port->napi);
1406 if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK)
1407 skb->ip_summed = CHECKSUM_UNNECESSARY;
1410 port->stats.rx_bytes += frame_len;
1411 port->stats.rx_packets++;
1415 static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
1417 struct gemini_ethernet_port *port = netdev_priv(netdev);
1418 unsigned short m = (1 << port->rxq_order) - 1;
1419 struct gemini_ethernet *geth = port->geth;
1420 void __iomem *ptr_reg = port->rxq_rwptr;
1421 unsigned int frame_len, frag_len;
1422 struct gmac_rxdesc *rx = NULL;
1423 struct gmac_queue_page *gpage;
1424 static struct sk_buff *skb;
1425 union gmac_rxdesc_0 word0;
1426 union gmac_rxdesc_1 word1;
1427 union gmac_rxdesc_3 word3;
1428 struct page *page = NULL;
1429 unsigned int page_offs;
1430 unsigned short r, w;
1435 rw.bits32 = readl(ptr_reg);
1436 /* Reset interrupt as all packages until here are taken into account */
1437 writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
1438 geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1442 while (budget && w != r) {
1443 rx = port->rxq_ring + r;
1446 mapping = rx->word2.buf_adr;
1452 frag_len = word0.bits.buffer_size;
1453 frame_len = word1.bits.byte_count;
1454 page_offs = mapping & ~PAGE_MASK;
1458 "rxq[%u]: HW BUG: zero DMA desc\n", r);
1462 /* Freeq pointers are one page off */
1463 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
1465 dev_err(geth->dev, "could not find mapping\n");
1470 if (word3.bits32 & SOF_BIT) {
1472 napi_free_frags(&port->napi);
1473 port->stats.rx_dropped++;
1476 skb = gmac_skb_if_good_frame(port, word0, frame_len);
1480 page_offs += NET_IP_ALIGN;
1481 frag_len -= NET_IP_ALIGN;
1489 if (word3.bits32 & EOF_BIT)
1490 frag_len = frame_len - skb->len;
1492 /* append page frag to skb */
1493 if (frag_nr == MAX_SKB_FRAGS)
1497 netdev_err(netdev, "Received fragment with len = 0\n");
1499 skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
1500 skb->len += frag_len;
1501 skb->data_len += frag_len;
1502 skb->truesize += frag_len;
1505 if (word3.bits32 & EOF_BIT) {
1506 napi_gro_frags(&port->napi);
1514 napi_free_frags(&port->napi);
1521 port->stats.rx_dropped++;
1528 static int gmac_napi_poll(struct napi_struct *napi, int budget)
1530 struct gemini_ethernet_port *port = netdev_priv(napi->dev);
1531 struct gemini_ethernet *geth = port->geth;
1532 unsigned int freeq_threshold;
1533 unsigned int received;
1535 freeq_threshold = 1 << (geth->freeq_order - 1);
1536 u64_stats_update_begin(&port->rx_stats_syncp);
1538 received = gmac_rx(napi->dev, budget);
1539 if (received < budget) {
1540 napi_gro_flush(napi, false);
1541 napi_complete_done(napi, received);
1542 gmac_enable_rx_irq(napi->dev, 1);
1543 ++port->rx_napi_exits;
1546 port->freeq_refill += (budget - received);
1547 if (port->freeq_refill > freeq_threshold) {
1548 port->freeq_refill -= freeq_threshold;
1549 geth_fill_freeq(geth, true);
1552 u64_stats_update_end(&port->rx_stats_syncp);
1556 static void gmac_dump_dma_state(struct net_device *netdev)
1558 struct gemini_ethernet_port *port = netdev_priv(netdev);
1559 struct gemini_ethernet *geth = port->geth;
1560 void __iomem *ptr_reg;
1563 /* Interrupt status */
1564 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1565 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1566 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
1567 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
1568 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1569 netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1570 reg[0], reg[1], reg[2], reg[3], reg[4]);
1572 /* Interrupt enable */
1573 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1574 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1575 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
1576 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
1577 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1578 netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1579 reg[0], reg[1], reg[2], reg[3], reg[4]);
1582 reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG);
1583 reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG);
1584 reg[2] = GET_RPTR(port->rxq_rwptr);
1585 reg[3] = GET_WPTR(port->rxq_rwptr);
1586 netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1587 reg[0], reg[1], reg[2], reg[3]);
1589 reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG);
1590 reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG);
1591 reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG);
1592 reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG);
1593 netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1594 reg[0], reg[1], reg[2], reg[3]);
1597 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
1599 reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG);
1600 reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG);
1601 reg[2] = GET_RPTR(ptr_reg);
1602 reg[3] = GET_WPTR(ptr_reg);
1603 netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1604 reg[0], reg[1], reg[2], reg[3]);
1606 reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG);
1607 reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG);
1608 reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG);
1609 reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG);
1610 netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1611 reg[0], reg[1], reg[2], reg[3]);
1613 /* FREE queues status */
1614 ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG;
1616 reg[0] = GET_RPTR(ptr_reg);
1617 reg[1] = GET_WPTR(ptr_reg);
1619 ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG;
1621 reg[2] = GET_RPTR(ptr_reg);
1622 reg[3] = GET_WPTR(ptr_reg);
1623 netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n",
1624 reg[0], reg[1], reg[2], reg[3]);
1627 static void gmac_update_hw_stats(struct net_device *netdev)
1629 struct gemini_ethernet_port *port = netdev_priv(netdev);
1630 unsigned int rx_discards, rx_mcast, rx_bcast;
1631 struct gemini_ethernet *geth = port->geth;
1632 unsigned long flags;
1634 spin_lock_irqsave(&geth->irq_lock, flags);
1635 u64_stats_update_begin(&port->ir_stats_syncp);
1637 rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS);
1638 port->hw_stats[0] += rx_discards;
1639 port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS);
1640 rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST);
1641 port->hw_stats[2] += rx_mcast;
1642 rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST);
1643 port->hw_stats[3] += rx_bcast;
1644 port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1);
1645 port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2);
1647 port->stats.rx_missed_errors += rx_discards;
1648 port->stats.multicast += rx_mcast;
1649 port->stats.multicast += rx_bcast;
1651 writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8),
1652 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1654 u64_stats_update_end(&port->ir_stats_syncp);
1655 spin_unlock_irqrestore(&geth->irq_lock, flags);
1659 * gmac_get_intr_flags() - get interrupt status flags for a port from
1660 * @netdev: the net device for the port to get flags from
1661 * @i: the interrupt status register 0..4
1663 static u32 gmac_get_intr_flags(struct net_device *netdev, int i)
1665 struct gemini_ethernet_port *port = netdev_priv(netdev);
1666 struct gemini_ethernet *geth = port->geth;
1667 void __iomem *irqif_reg, *irqen_reg;
1668 unsigned int offs, val;
1670 /* Calculate the offset using the stride of the status registers */
1671 offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG -
1672 GLOBAL_INTERRUPT_STATUS_0_REG);
1674 irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs;
1675 irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs;
1677 val = readl(irqif_reg) & readl(irqen_reg);
1681 static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer)
1683 struct gemini_ethernet_port *port =
1684 container_of(timer, struct gemini_ethernet_port,
1687 napi_schedule(&port->napi);
1688 return HRTIMER_NORESTART;
1691 static irqreturn_t gmac_irq(int irq, void *data)
1693 struct gemini_ethernet_port *port;
1694 struct net_device *netdev = data;
1695 struct gemini_ethernet *geth;
1698 port = netdev_priv(netdev);
1701 val = gmac_get_intr_flags(netdev, 0);
1704 if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) {
1706 netdev_err(netdev, "hw failure/sw bug\n");
1707 gmac_dump_dma_state(netdev);
1709 /* don't know how to recover, just reduce losses */
1710 gmac_enable_irq(netdev, 0);
1714 if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6)))
1715 gmac_tx_irq(netdev, 0);
1717 val = gmac_get_intr_flags(netdev, 1);
1720 if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) {
1721 gmac_enable_rx_irq(netdev, 0);
1723 if (!port->rx_coalesce_nsecs) {
1724 napi_schedule(&port->napi);
1728 ktime = ktime_set(0, port->rx_coalesce_nsecs);
1729 hrtimer_start(&port->rx_coalesce_timer, ktime,
1734 val = gmac_get_intr_flags(netdev, 4);
1737 if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8)))
1738 gmac_update_hw_stats(netdev);
1740 if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
1741 writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
1742 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1744 spin_lock(&geth->irq_lock);
1745 u64_stats_update_begin(&port->ir_stats_syncp);
1746 ++port->stats.rx_fifo_errors;
1747 u64_stats_update_end(&port->ir_stats_syncp);
1748 spin_unlock(&geth->irq_lock);
1751 return orr ? IRQ_HANDLED : IRQ_NONE;
1754 static void gmac_start_dma(struct gemini_ethernet_port *port)
1756 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1757 union gmac_dma_ctrl dma_ctrl;
1759 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1760 dma_ctrl.bits.rd_enable = 1;
1761 dma_ctrl.bits.td_enable = 1;
1762 dma_ctrl.bits.loopback = 0;
1763 dma_ctrl.bits.drop_small_ack = 0;
1764 dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN;
1765 dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED;
1766 dma_ctrl.bits.rd_burst_size = HBURST_INCR8;
1767 dma_ctrl.bits.rd_bus = HSIZE_8;
1768 dma_ctrl.bits.td_prot = HPROT_DATA_CACHE;
1769 dma_ctrl.bits.td_burst_size = HBURST_INCR8;
1770 dma_ctrl.bits.td_bus = HSIZE_8;
1772 writel(dma_ctrl.bits32, dma_ctrl_reg);
1775 static void gmac_stop_dma(struct gemini_ethernet_port *port)
1777 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1778 union gmac_dma_ctrl dma_ctrl;
1780 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1781 dma_ctrl.bits.rd_enable = 0;
1782 dma_ctrl.bits.td_enable = 0;
1783 writel(dma_ctrl.bits32, dma_ctrl_reg);
1786 static int gmac_open(struct net_device *netdev)
1788 struct gemini_ethernet_port *port = netdev_priv(netdev);
1791 err = request_irq(netdev->irq, gmac_irq,
1792 IRQF_SHARED, netdev->name, netdev);
1794 netdev_err(netdev, "no IRQ\n");
1798 netif_carrier_off(netdev);
1799 phy_start(netdev->phydev);
1801 err = geth_resize_freeq(port);
1802 /* It's fine if it's just busy, the other port has set up
1803 * the freeq in that case.
1805 if (err && (err != -EBUSY)) {
1806 netdev_err(netdev, "could not resize freeq\n");
1810 err = gmac_setup_rxq(netdev);
1812 netdev_err(netdev, "could not setup RXQ\n");
1816 err = gmac_setup_txqs(netdev);
1818 netdev_err(netdev, "could not setup TXQs\n");
1819 gmac_cleanup_rxq(netdev);
1823 napi_enable(&port->napi);
1825 gmac_start_dma(port);
1826 gmac_enable_irq(netdev, 1);
1827 gmac_enable_tx_rx(netdev);
1828 netif_tx_start_all_queues(netdev);
1830 hrtimer_init(&port->rx_coalesce_timer, CLOCK_MONOTONIC,
1832 port->rx_coalesce_timer.function = &gmac_coalesce_delay_expired;
1834 netdev_dbg(netdev, "opened\n");
1839 phy_stop(netdev->phydev);
1840 free_irq(netdev->irq, netdev);
1844 static int gmac_stop(struct net_device *netdev)
1846 struct gemini_ethernet_port *port = netdev_priv(netdev);
1848 hrtimer_cancel(&port->rx_coalesce_timer);
1849 netif_tx_stop_all_queues(netdev);
1850 gmac_disable_tx_rx(netdev);
1851 gmac_stop_dma(port);
1852 napi_disable(&port->napi);
1854 gmac_enable_irq(netdev, 0);
1855 gmac_cleanup_rxq(netdev);
1856 gmac_cleanup_txqs(netdev);
1858 phy_stop(netdev->phydev);
1859 free_irq(netdev->irq, netdev);
1861 gmac_update_hw_stats(netdev);
1865 static void gmac_set_rx_mode(struct net_device *netdev)
1867 struct gemini_ethernet_port *port = netdev_priv(netdev);
1868 union gmac_rx_fltr filter = { .bits = {
1873 struct netdev_hw_addr *ha;
1874 unsigned int bit_nr;
1880 if (netdev->flags & IFF_PROMISC) {
1881 filter.bits.error = 1;
1882 filter.bits.promiscuous = 1;
1885 } else if (netdev->flags & IFF_ALLMULTI) {
1889 netdev_for_each_mc_addr(ha, netdev) {
1890 bit_nr = ~crc32_le(~0, ha->addr, ETH_ALEN) & 0x3f;
1891 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 0x1f);
1895 writel(mc_filter[0], port->gmac_base + GMAC_MCAST_FIL0);
1896 writel(mc_filter[1], port->gmac_base + GMAC_MCAST_FIL1);
1897 writel(filter.bits32, port->gmac_base + GMAC_RX_FLTR);
1900 static void gmac_write_mac_address(struct net_device *netdev)
1902 struct gemini_ethernet_port *port = netdev_priv(netdev);
1905 memset(addr, 0, sizeof(addr));
1906 memcpy(addr, netdev->dev_addr, ETH_ALEN);
1908 writel(le32_to_cpu(addr[0]), port->gmac_base + GMAC_STA_ADD0);
1909 writel(le32_to_cpu(addr[1]), port->gmac_base + GMAC_STA_ADD1);
1910 writel(le32_to_cpu(addr[2]), port->gmac_base + GMAC_STA_ADD2);
1913 static int gmac_set_mac_address(struct net_device *netdev, void *addr)
1915 struct sockaddr *sa = addr;
1917 memcpy(netdev->dev_addr, sa->sa_data, ETH_ALEN);
1918 gmac_write_mac_address(netdev);
1923 static void gmac_clear_hw_stats(struct net_device *netdev)
1925 struct gemini_ethernet_port *port = netdev_priv(netdev);
1927 readl(port->gmac_base + GMAC_IN_DISCARDS);
1928 readl(port->gmac_base + GMAC_IN_ERRORS);
1929 readl(port->gmac_base + GMAC_IN_MCAST);
1930 readl(port->gmac_base + GMAC_IN_BCAST);
1931 readl(port->gmac_base + GMAC_IN_MAC1);
1932 readl(port->gmac_base + GMAC_IN_MAC2);
1935 static void gmac_get_stats64(struct net_device *netdev,
1936 struct rtnl_link_stats64 *stats)
1938 struct gemini_ethernet_port *port = netdev_priv(netdev);
1941 gmac_update_hw_stats(netdev);
1943 /* Racing with RX NAPI */
1945 start = u64_stats_fetch_begin_irq(&port->rx_stats_syncp);
1947 stats->rx_packets = port->stats.rx_packets;
1948 stats->rx_bytes = port->stats.rx_bytes;
1949 stats->rx_errors = port->stats.rx_errors;
1950 stats->rx_dropped = port->stats.rx_dropped;
1952 stats->rx_length_errors = port->stats.rx_length_errors;
1953 stats->rx_over_errors = port->stats.rx_over_errors;
1954 stats->rx_crc_errors = port->stats.rx_crc_errors;
1955 stats->rx_frame_errors = port->stats.rx_frame_errors;
1957 } while (u64_stats_fetch_retry_irq(&port->rx_stats_syncp, start));
1959 /* Racing with MIB and TX completion interrupts */
1961 start = u64_stats_fetch_begin_irq(&port->ir_stats_syncp);
1963 stats->tx_errors = port->stats.tx_errors;
1964 stats->tx_packets = port->stats.tx_packets;
1965 stats->tx_bytes = port->stats.tx_bytes;
1967 stats->multicast = port->stats.multicast;
1968 stats->rx_missed_errors = port->stats.rx_missed_errors;
1969 stats->rx_fifo_errors = port->stats.rx_fifo_errors;
1971 } while (u64_stats_fetch_retry_irq(&port->ir_stats_syncp, start));
1973 /* Racing with hard_start_xmit */
1975 start = u64_stats_fetch_begin_irq(&port->tx_stats_syncp);
1977 stats->tx_dropped = port->stats.tx_dropped;
1979 } while (u64_stats_fetch_retry_irq(&port->tx_stats_syncp, start));
1981 stats->rx_dropped += stats->rx_missed_errors;
1984 static int gmac_change_mtu(struct net_device *netdev, int new_mtu)
1986 int max_len = gmac_pick_rx_max_len(new_mtu);
1991 gmac_disable_tx_rx(netdev);
1993 netdev->mtu = new_mtu;
1994 gmac_update_config0_reg(netdev, max_len << CONFIG0_MAXLEN_SHIFT,
1995 CONFIG0_MAXLEN_MASK);
1997 netdev_update_features(netdev);
1999 gmac_enable_tx_rx(netdev);
2004 static int gmac_set_features(struct net_device *netdev,
2005 netdev_features_t features)
2007 struct gemini_ethernet_port *port = netdev_priv(netdev);
2008 int enable = features & NETIF_F_RXCSUM;
2009 unsigned long flags;
2012 spin_lock_irqsave(&port->config_lock, flags);
2014 reg = readl(port->gmac_base + GMAC_CONFIG0);
2015 reg = enable ? reg | CONFIG0_RX_CHKSUM : reg & ~CONFIG0_RX_CHKSUM;
2016 writel(reg, port->gmac_base + GMAC_CONFIG0);
2018 spin_unlock_irqrestore(&port->config_lock, flags);
2022 static int gmac_get_sset_count(struct net_device *netdev, int sset)
2024 return sset == ETH_SS_STATS ? GMAC_STATS_NUM : 0;
2027 static void gmac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
2029 if (stringset != ETH_SS_STATS)
2032 memcpy(data, gmac_stats_strings, sizeof(gmac_stats_strings));
2035 static void gmac_get_ethtool_stats(struct net_device *netdev,
2036 struct ethtool_stats *estats, u64 *values)
2038 struct gemini_ethernet_port *port = netdev_priv(netdev);
2043 gmac_update_hw_stats(netdev);
2045 /* Racing with MIB interrupt */
2048 start = u64_stats_fetch_begin_irq(&port->ir_stats_syncp);
2050 for (i = 0; i < RX_STATS_NUM; i++)
2051 *p++ = port->hw_stats[i];
2053 } while (u64_stats_fetch_retry_irq(&port->ir_stats_syncp, start));
2056 /* Racing with RX NAPI */
2059 start = u64_stats_fetch_begin_irq(&port->rx_stats_syncp);
2061 for (i = 0; i < RX_STATUS_NUM; i++)
2062 *p++ = port->rx_stats[i];
2063 for (i = 0; i < RX_CHKSUM_NUM; i++)
2064 *p++ = port->rx_csum_stats[i];
2065 *p++ = port->rx_napi_exits;
2067 } while (u64_stats_fetch_retry_irq(&port->rx_stats_syncp, start));
2070 /* Racing with TX start_xmit */
2073 start = u64_stats_fetch_begin_irq(&port->tx_stats_syncp);
2075 for (i = 0; i < TX_MAX_FRAGS; i++) {
2076 *values++ = port->tx_frag_stats[i];
2077 port->tx_frag_stats[i] = 0;
2079 *values++ = port->tx_frags_linearized;
2080 *values++ = port->tx_hw_csummed;
2082 } while (u64_stats_fetch_retry_irq(&port->tx_stats_syncp, start));
2085 static int gmac_get_ksettings(struct net_device *netdev,
2086 struct ethtool_link_ksettings *cmd)
2088 if (!netdev->phydev)
2090 phy_ethtool_ksettings_get(netdev->phydev, cmd);
2095 static int gmac_set_ksettings(struct net_device *netdev,
2096 const struct ethtool_link_ksettings *cmd)
2098 if (!netdev->phydev)
2100 return phy_ethtool_ksettings_set(netdev->phydev, cmd);
2103 static int gmac_nway_reset(struct net_device *netdev)
2105 if (!netdev->phydev)
2107 return phy_start_aneg(netdev->phydev);
2110 static void gmac_get_pauseparam(struct net_device *netdev,
2111 struct ethtool_pauseparam *pparam)
2113 struct gemini_ethernet_port *port = netdev_priv(netdev);
2114 union gmac_config0 config0;
2116 config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2118 pparam->rx_pause = config0.bits.rx_fc_en;
2119 pparam->tx_pause = config0.bits.tx_fc_en;
2120 pparam->autoneg = true;
2123 static void gmac_get_ringparam(struct net_device *netdev,
2124 struct ethtool_ringparam *rp)
2126 struct gemini_ethernet_port *port = netdev_priv(netdev);
2128 readl(port->gmac_base + GMAC_CONFIG0);
2130 rp->rx_max_pending = 1 << 15;
2131 rp->rx_mini_max_pending = 0;
2132 rp->rx_jumbo_max_pending = 0;
2133 rp->tx_max_pending = 1 << 15;
2135 rp->rx_pending = 1 << port->rxq_order;
2136 rp->rx_mini_pending = 0;
2137 rp->rx_jumbo_pending = 0;
2138 rp->tx_pending = 1 << port->txq_order;
2141 static int gmac_set_ringparam(struct net_device *netdev,
2142 struct ethtool_ringparam *rp)
2144 struct gemini_ethernet_port *port = netdev_priv(netdev);
2147 if (netif_running(netdev))
2150 if (rp->rx_pending) {
2151 port->rxq_order = min(15, ilog2(rp->rx_pending - 1) + 1);
2152 err = geth_resize_freeq(port);
2154 if (rp->tx_pending) {
2155 port->txq_order = min(15, ilog2(rp->tx_pending - 1) + 1);
2156 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
2162 static int gmac_get_coalesce(struct net_device *netdev,
2163 struct ethtool_coalesce *ecmd)
2165 struct gemini_ethernet_port *port = netdev_priv(netdev);
2167 ecmd->rx_max_coalesced_frames = 1;
2168 ecmd->tx_max_coalesced_frames = port->irq_every_tx_packets;
2169 ecmd->rx_coalesce_usecs = port->rx_coalesce_nsecs / 1000;
2174 static int gmac_set_coalesce(struct net_device *netdev,
2175 struct ethtool_coalesce *ecmd)
2177 struct gemini_ethernet_port *port = netdev_priv(netdev);
2179 if (ecmd->tx_max_coalesced_frames < 1)
2181 if (ecmd->tx_max_coalesced_frames >= 1 << port->txq_order)
2184 port->irq_every_tx_packets = ecmd->tx_max_coalesced_frames;
2185 port->rx_coalesce_nsecs = ecmd->rx_coalesce_usecs * 1000;
2190 static u32 gmac_get_msglevel(struct net_device *netdev)
2192 struct gemini_ethernet_port *port = netdev_priv(netdev);
2194 return port->msg_enable;
2197 static void gmac_set_msglevel(struct net_device *netdev, u32 level)
2199 struct gemini_ethernet_port *port = netdev_priv(netdev);
2201 port->msg_enable = level;
2204 static void gmac_get_drvinfo(struct net_device *netdev,
2205 struct ethtool_drvinfo *info)
2207 strcpy(info->driver, DRV_NAME);
2208 strcpy(info->bus_info, netdev->dev_id ? "1" : "0");
2211 static const struct net_device_ops gmac_351x_ops = {
2212 .ndo_init = gmac_init,
2213 .ndo_open = gmac_open,
2214 .ndo_stop = gmac_stop,
2215 .ndo_start_xmit = gmac_start_xmit,
2216 .ndo_tx_timeout = gmac_tx_timeout,
2217 .ndo_set_rx_mode = gmac_set_rx_mode,
2218 .ndo_set_mac_address = gmac_set_mac_address,
2219 .ndo_get_stats64 = gmac_get_stats64,
2220 .ndo_change_mtu = gmac_change_mtu,
2221 .ndo_set_features = gmac_set_features,
2224 static const struct ethtool_ops gmac_351x_ethtool_ops = {
2225 .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS |
2226 ETHTOOL_COALESCE_MAX_FRAMES,
2227 .get_sset_count = gmac_get_sset_count,
2228 .get_strings = gmac_get_strings,
2229 .get_ethtool_stats = gmac_get_ethtool_stats,
2230 .get_link = ethtool_op_get_link,
2231 .get_link_ksettings = gmac_get_ksettings,
2232 .set_link_ksettings = gmac_set_ksettings,
2233 .nway_reset = gmac_nway_reset,
2234 .get_pauseparam = gmac_get_pauseparam,
2235 .get_ringparam = gmac_get_ringparam,
2236 .set_ringparam = gmac_set_ringparam,
2237 .get_coalesce = gmac_get_coalesce,
2238 .set_coalesce = gmac_set_coalesce,
2239 .get_msglevel = gmac_get_msglevel,
2240 .set_msglevel = gmac_set_msglevel,
2241 .get_drvinfo = gmac_get_drvinfo,
2244 static irqreturn_t gemini_port_irq_thread(int irq, void *data)
2246 unsigned long irqmask = SWFQ_EMPTY_INT_BIT;
2247 struct gemini_ethernet_port *port = data;
2248 struct gemini_ethernet *geth;
2249 unsigned long flags;
2252 /* The queue is half empty so refill it */
2253 geth_fill_freeq(geth, true);
2255 spin_lock_irqsave(&geth->irq_lock, flags);
2256 /* ACK queue interrupt */
2257 writel(irqmask, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2258 /* Enable queue interrupt again */
2259 irqmask |= readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2260 writel(irqmask, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2261 spin_unlock_irqrestore(&geth->irq_lock, flags);
2266 static irqreturn_t gemini_port_irq(int irq, void *data)
2268 struct gemini_ethernet_port *port = data;
2269 struct gemini_ethernet *geth;
2270 irqreturn_t ret = IRQ_NONE;
2274 spin_lock(&geth->irq_lock);
2276 val = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2277 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2279 if (val & en & SWFQ_EMPTY_INT_BIT) {
2280 /* Disable the queue empty interrupt while we work on
2281 * processing the queue. Also disable overrun interrupts
2282 * as there is not much we can do about it here.
2284 en &= ~(SWFQ_EMPTY_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT
2285 | GMAC1_RX_OVERRUN_INT_BIT);
2286 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2287 ret = IRQ_WAKE_THREAD;
2290 spin_unlock(&geth->irq_lock);
2295 static void gemini_port_remove(struct gemini_ethernet_port *port)
2298 phy_disconnect(port->netdev->phydev);
2299 unregister_netdev(port->netdev);
2301 clk_disable_unprepare(port->pclk);
2302 geth_cleanup_freeq(port->geth);
2305 static void gemini_ethernet_init(struct gemini_ethernet *geth)
2307 /* Only do this once both ports are online */
2308 if (geth->initialized)
2310 if (geth->port0 && geth->port1)
2311 geth->initialized = true;
2315 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
2316 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
2317 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
2318 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
2319 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2321 /* Interrupt config:
2323 * GMAC0 intr bits ------> int0 ----> eth0
2324 * GMAC1 intr bits ------> int1 ----> eth1
2325 * TOE intr -------------> int1 ----> eth1
2326 * Classification Intr --> int0 ----> eth0
2327 * Default Q0 -----------> int0 ----> eth0
2328 * Default Q1 -----------> int1 ----> eth1
2329 * FreeQ intr -----------> int1 ----> eth1
2331 writel(0xCCFC0FC0, geth->base + GLOBAL_INTERRUPT_SELECT_0_REG);
2332 writel(0x00F00002, geth->base + GLOBAL_INTERRUPT_SELECT_1_REG);
2333 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_2_REG);
2334 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_3_REG);
2335 writel(0xFF000003, geth->base + GLOBAL_INTERRUPT_SELECT_4_REG);
2337 /* edge-triggered interrupts packed to level-triggered one... */
2338 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
2339 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
2340 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
2341 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
2342 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2345 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
2346 writel(0, geth->base + GLOBAL_HW_FREEQ_BASE_SIZE_REG);
2347 writel(0, geth->base + GLOBAL_SWFQ_RWPTR_REG);
2348 writel(0, geth->base + GLOBAL_HWFQ_RWPTR_REG);
2350 geth->freeq_frag_order = DEFAULT_RX_BUF_ORDER;
2351 /* This makes the queue resize on probe() so that we
2352 * set up and enable the queue IRQ. FIXME: fragile.
2354 geth->freeq_order = 1;
2357 static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port)
2360 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD0));
2362 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD1));
2364 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD2));
2367 static int gemini_ethernet_port_probe(struct platform_device *pdev)
2369 char *port_names[2] = { "ethernet0", "ethernet1" };
2370 struct gemini_ethernet_port *port;
2371 struct device *dev = &pdev->dev;
2372 struct gemini_ethernet *geth;
2373 struct net_device *netdev;
2374 struct resource *gmacres;
2375 struct resource *dmares;
2376 struct device *parent;
2381 parent = dev->parent;
2382 geth = dev_get_drvdata(parent);
2384 if (!strcmp(dev_name(dev), "60008000.ethernet-port"))
2386 else if (!strcmp(dev_name(dev), "6000c000.ethernet-port"))
2391 dev_info(dev, "probe %s ID %d\n", dev_name(dev), id);
2393 netdev = devm_alloc_etherdev_mqs(dev, sizeof(*port), TX_QUEUE_NUM, TX_QUEUE_NUM);
2395 dev_err(dev, "Can't allocate ethernet device #%d\n", id);
2399 port = netdev_priv(netdev);
2400 SET_NETDEV_DEV(netdev, dev);
2401 port->netdev = netdev;
2405 port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2408 dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2410 dev_err(dev, "no DMA resource\n");
2413 port->dma_base = devm_ioremap_resource(dev, dmares);
2414 if (IS_ERR(port->dma_base))
2415 return PTR_ERR(port->dma_base);
2417 /* GMAC config memory */
2418 gmacres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2420 dev_err(dev, "no GMAC resource\n");
2423 port->gmac_base = devm_ioremap_resource(dev, gmacres);
2424 if (IS_ERR(port->gmac_base))
2425 return PTR_ERR(port->gmac_base);
2428 irq = platform_get_irq(pdev, 0);
2430 return irq ? irq : -ENODEV;
2433 /* Clock the port */
2434 port->pclk = devm_clk_get(dev, "PCLK");
2435 if (IS_ERR(port->pclk)) {
2436 dev_err(dev, "no PCLK\n");
2437 return PTR_ERR(port->pclk);
2439 ret = clk_prepare_enable(port->pclk);
2443 /* Maybe there is a nice ethernet address we should use */
2444 gemini_port_save_mac_addr(port);
2446 /* Reset the port */
2447 port->reset = devm_reset_control_get_exclusive(dev, NULL);
2448 if (IS_ERR(port->reset)) {
2449 dev_err(dev, "no reset\n");
2450 ret = PTR_ERR(port->reset);
2453 reset_control_reset(port->reset);
2454 usleep_range(100, 500);
2456 /* Assign pointer in the main state container */
2462 /* This will just be done once both ports are up and reset */
2463 gemini_ethernet_init(geth);
2465 platform_set_drvdata(pdev, port);
2467 /* Set up and register the netdev */
2468 netdev->dev_id = port->id;
2470 netdev->netdev_ops = &gmac_351x_ops;
2471 netdev->ethtool_ops = &gmac_351x_ethtool_ops;
2473 spin_lock_init(&port->config_lock);
2474 gmac_clear_hw_stats(netdev);
2476 netdev->hw_features = GMAC_OFFLOAD_FEATURES;
2477 netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO;
2478 /* We can receive jumbo frames up to 10236 bytes but only
2479 * transmit 2047 bytes so, let's accept payloads of 2047
2480 * bytes minus VLAN and ethernet header
2482 netdev->min_mtu = ETH_MIN_MTU;
2483 netdev->max_mtu = MTU_SIZE_BIT_MASK - VLAN_ETH_HLEN;
2485 port->freeq_refill = 0;
2486 netif_napi_add(netdev, &port->napi, gmac_napi_poll,
2487 DEFAULT_NAPI_WEIGHT);
2489 if (is_valid_ether_addr((void *)port->mac_addr)) {
2490 memcpy(netdev->dev_addr, port->mac_addr, ETH_ALEN);
2492 dev_dbg(dev, "ethernet address 0x%08x%08x%08x invalid\n",
2493 port->mac_addr[0], port->mac_addr[1],
2495 dev_info(dev, "using a random ethernet address\n");
2496 eth_random_addr(netdev->dev_addr);
2498 gmac_write_mac_address(netdev);
2500 ret = devm_request_threaded_irq(port->dev,
2503 gemini_port_irq_thread,
2505 port_names[port->id],
2510 ret = gmac_setup_phy(netdev);
2513 "PHY init failed\n");
2517 ret = register_netdev(netdev);
2522 "irq %d, DMA @ 0x%pap, GMAC @ 0x%pap\n",
2523 port->irq, &dmares->start,
2528 clk_disable_unprepare(port->pclk);
2532 static int gemini_ethernet_port_remove(struct platform_device *pdev)
2534 struct gemini_ethernet_port *port = platform_get_drvdata(pdev);
2536 gemini_port_remove(port);
2541 static const struct of_device_id gemini_ethernet_port_of_match[] = {
2543 .compatible = "cortina,gemini-ethernet-port",
2547 MODULE_DEVICE_TABLE(of, gemini_ethernet_port_of_match);
2549 static struct platform_driver gemini_ethernet_port_driver = {
2551 .name = "gemini-ethernet-port",
2552 .of_match_table = of_match_ptr(gemini_ethernet_port_of_match),
2554 .probe = gemini_ethernet_port_probe,
2555 .remove = gemini_ethernet_port_remove,
2558 static int gemini_ethernet_probe(struct platform_device *pdev)
2560 struct device *dev = &pdev->dev;
2561 struct gemini_ethernet *geth;
2562 unsigned int retry = 5;
2563 struct resource *res;
2566 /* Global registers */
2567 geth = devm_kzalloc(dev, sizeof(*geth), GFP_KERNEL);
2570 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2573 geth->base = devm_ioremap_resource(dev, res);
2574 if (IS_ERR(geth->base))
2575 return PTR_ERR(geth->base);
2578 /* Wait for ports to stabilize */
2581 val = readl(geth->base + GLOBAL_TOE_VERSION_REG);
2583 } while (!val && --retry);
2585 dev_err(dev, "failed to reset ethernet\n");
2588 dev_info(dev, "Ethernet device ID: 0x%03x, revision 0x%01x\n",
2589 (val >> 4) & 0xFFFU, val & 0xFU);
2591 spin_lock_init(&geth->irq_lock);
2592 spin_lock_init(&geth->freeq_lock);
2594 /* The children will use this */
2595 platform_set_drvdata(pdev, geth);
2597 /* Spawn child devices for the two ports */
2598 return devm_of_platform_populate(dev);
2601 static int gemini_ethernet_remove(struct platform_device *pdev)
2603 struct gemini_ethernet *geth = platform_get_drvdata(pdev);
2605 geth_cleanup_freeq(geth);
2606 geth->initialized = false;
2611 static const struct of_device_id gemini_ethernet_of_match[] = {
2613 .compatible = "cortina,gemini-ethernet",
2617 MODULE_DEVICE_TABLE(of, gemini_ethernet_of_match);
2619 static struct platform_driver gemini_ethernet_driver = {
2622 .of_match_table = of_match_ptr(gemini_ethernet_of_match),
2624 .probe = gemini_ethernet_probe,
2625 .remove = gemini_ethernet_remove,
2628 static int __init gemini_ethernet_module_init(void)
2632 ret = platform_driver_register(&gemini_ethernet_port_driver);
2636 ret = platform_driver_register(&gemini_ethernet_driver);
2638 platform_driver_unregister(&gemini_ethernet_port_driver);
2644 module_init(gemini_ethernet_module_init);
2646 static void __exit gemini_ethernet_module_exit(void)
2648 platform_driver_unregister(&gemini_ethernet_driver);
2649 platform_driver_unregister(&gemini_ethernet_port_driver);
2651 module_exit(gemini_ethernet_module_exit);
2653 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
2654 MODULE_DESCRIPTION("StorLink SL351x (Gemini) ethernet driver");
2655 MODULE_LICENSE("GPL");
2656 MODULE_ALIAS("platform:" DRV_NAME);